Spanish mackerel vs seerfish

Spanish mackerel

noun
  • Any member of a tribe of mackerel (Scomberomorini) 

seerfish

noun
  • Any of Scomberomorini, a tribe of ray-finned bony fishes in the mackerel family. 

How often have the words Spanish mackerel and seerfish occurred in a corpus of books? (source: Google Ngram Viewer )